Elevator button

Feedback system

The implementation of feedback lights probably prevented the murder of numerous elevator buttons.

Last time you stepped in an elevator and pressed a button, you probably expected a light to turn on, or a floor number to be displayed. Did you once take an elevator that displayed no light or floor indication when you pressed a button? This happened to me recently, and I can tell you that I was immediately annoyed and started pressing the button frantically until the doors of the elevator begun to close.

Picture: Elevator buttons
Picture credits: Coline Pannier